Sodium sulfate
Hexane
Heptane
Octane
Nonane
Butane
Toluene
Carbon tetrachloride
~~ Many ionic metal compounds are insoluble in water “insoluble salts” .
calcium, carbonate, copper (I) chloride, lead sulfide
~~All non polar compounds and macromolecules
*****For you selection in the picture CaCO3 is insoluble in water ~~reason: because the electrostatic bonds between the carbonate anion and the calcium ion are too strong to be overcome by solvation by water molecules*******